A differential sub-nanosecond high-isolation absorptive active SiGe 24 GHz switch for UWB applications

This paper presents the design and measurement of a SiGe sub-nanosecond, high isolation, single-pole double-throw (SPDT) and single-pole single-throw (SPST) differential absorptive active switch at 24 GHz for ultrawideband (UWB) applications. The switch and digital driver consume 24 mA from a 5 V supply. The active area of the SPDT and SPST is 1000 /spl mu/m /spl times/ 550 /spl mu/m and 670 /spl mu/m /spl times/ 340 /spl mu/m respectively. The novel circuit topology implements a SPDT that inherently maintains the port impedances regardless of the state of the switch. The insertion loss is less than 3 dB over the 20-26 GHz range and the isolation is >42 dB at 10-30 GHz with a switching time of 100 ps.

[1]  A. Madjar,et al.  Fully terminated Ka band high isolation, high power MMIC SPDT switch in GaAs PIN technology , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[2]  I. Gresham,et al.  A fast switching, high isolation absorptive SPST SiGe switch for 24 GHz automotive applications , 2003, 33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C).

[3]  I. Gresham,et al.  Ultra wide band 24 GHz automotive radar front-end , 2003, IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2003.

[4]  T. Katoh,et al.  Millimeter-wave MMIC switches with pHEMT cells reduced parasitic inductance , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[5]  M. Takahashi,et al.  An antenna switch MMIC using E/D mode p-HEMT for GSM/DCS/PCS/WCDMA bands application , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[6]  D.G. Leeper.  Ultrawideband - the next step in short-range wireless , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[7]  N. Suematsu,et al.  A 0.8 dB insertion-loss, 23 dB isolation, 17.4 dBm power-handling, 5 GHz transmit/receive CMOS switch , 2003, IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 2003.

[8]  Ian Gresham,et al.  A Fast Switching, High Isolation Absorptive SPST SiGe Switch for 24GHz Automotive Applications , 2003, 2003 33rd European Microwave Conference, 2003.

[9]  T. Boles,et al.  Heterojunction PIN diode switch , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[10]  N. Kinayman,et al.  Low-loss high-isolation 60-80 GHz GaAs SPST PIN switch , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.